Ceramic Biomaterials. Lecture #17
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1 Ceramic Biomaterials Lecture #17
2 Ceramics Refractory (maintain shape and composition at high temperatures) Polycrystalline Nonductile virtually zero creep at room temperatures Usually inorganic Silicates Metallic oxides Carbides Refractory hydrides, sulfides, and selenides Low heat conductivity Hard Moh scale Diamond 10 Talc 1 Alumina (Al 2 O 3 ) 9 Quartz (SiO 2 ) 8 Apatite (Ca 5 P 3 O 12 F) 5
3 Traditional Uses of Ceramics In form of pottery, used for thousands of years Until recently use was limited Brittle Susceptible to notching and microcracking Low tensile strength (but high compressive strength) Low impact resistance
4 Bioceramics Augment or replace various body parts especially bone Dental crowns Relative inertness to body fluids High compressive strength Aesthetically pleasing appearance Carbons Blood interfacing applications heart valves Tendons and ligaments
5 Desired Properties of Bioceramics Nontoxic Noncarcinogenic Nonallergic Biocompatible Functional for its lifetime in the host Ceramics must meet or exceed these requirements to be termed a bioceramic
6 Nonabsorbable (Relatively Bioinert) Bioceramics Pyrolytic carbon-coated devices Dense and nonporous aluminum oxides Porous aluminum oxides Zirconia ceramics Dense hydroxyapatites Calcium aluminates
7 Uses of Bioinert Bioceramics Reconstruction of acetabular cavities Bone plates and screws Ceramic-ceramic composites Ceramic-polymer composites Femoral heads Middle ear ossicles (small bones in the ear, malleus, incus, and stapes hammer, anvil, and stirrup) Reconstruction of orbital rims Total and partial hips Sterilization tubes Ventilation tubes Cardiovascular repair
8 Alumina (Al 2 O 3 ) Source: bauxite and corundum Calcination of alumina trihydrate Natural alumina is either sapphire or ruby, depending on impurities present Good wear properties Used in orthopedics for over 25 years joint replacement, total hip prosthesis Chemical Al 2 O 3 SiO 2 Fe 2 O 3 Na 2 O Composition (weight%) Chemical composition of Calcinated Alumina
9 Zirconia (ZrO 2 ) Derived from zircon ZrSiO 4 Y 2 O 3 used for stabilization Property Elastic modulus (GPa) Flexural strength (GPa) Alumina Good wear and friction Hardness, Mohs properties but not quite Density (g/cm 3 ) as good as alumina Grain size (µm) >0.4 Zirconia Physical properties of alumina and zirconia
10 Carbons Diamond Graphite Noncrystalline glassy carbon Quasicrystalline pyrolytic carbon
11 Properties of Various Types of Carbon Type of Carbon Property Graphite Glassy Pyrolytic Density (g/cm 3 ) Elastic Modulus (GPa) Compressive strength (MPa) Toughness (N m/cm 3 )
12 Strength and Modulus vs. Density for Pyrolytic Carbon (GPa)
13 Biodegradable or Resorbable Ceramics Plaster of Paris used as a bone substitute 1892 Biodegradable substitutes 1969 Replaced by endogenous tissue Almost all are variations on calcium phosphate
14 Examples of Biodegradable/Resorbable Bioceramics Al-Ca-P oxides Glass fibers and their composites Corals Calcium sulfates, incl. Plaster of Paris Fe +++ -Ca-P oxides Hydroxyapatites Tricalcium Phosphate Zn-Ca-P oxides Zn-SO 4 Ca-P oxides
15 Use of Biodegradable/Resorbable Bioceramics Drug delivery devices Repair of bone damaged by disease or trauma Filling space vaced by screws, donor bone, excised tumors, and disead bone loss Repairing and fusion of spinal and lumbo-sacral vertebrae Repairing herniated discs Repairing maxillofacial and dental defects Hydroxyapatite ocular implants
16 Calcium Phosphate Artificial bone Implants Solid or porous coatings May be crystallized into hydroxyapatite Ca 10 (PO 4 ) 6 (OH) 2 Mechanical properties vary greatly Property Elastic modulus (GPa) Compressive strength (MPa) Bending strength (MPa) Hardness (GPa) Value Poisson s Ratio 0.27 Density (theoretical, g/cm 3) 3.16 Physical properties of calcium phosphate
17 Hydroxyapatite Excellent biocompatibility Forms direct chemical bond with hard tissue On implant, new compact bone forms within 4-8 weeks
18 Aluminum-Calcium-Phosphate (ALCAP) Ceramics Developed in 1980 Unique Tailor where resorbtion takes place
19 Corraline Any of various red algae of the family Corallinaceae whose fronds are covered with calcareous deposits Main component calcium carbonate gradually resorbed Can be converted to hydroxyapatite Repair traumatized bone, replace diseased bone, correct bone defects
20 Tricalcium Phosphate (TCP) ceramics Correct peridontal defects Augment bony contours Ceramic matrix drug delivery systems More soulble than synthetic hydroxyapatite Good bone ingrowth
21 Zinc-Calcium Phosphorous Oxide (ZCAP) Ceramics Zn, essential for human metabolism Component of >30 metalloenzymes May be involved in wound healing Repair bone Deliver drugs
22 Zinc-Sulfate-Calcium-Phosphate Oxide (ZSCAP) Ceramics Formed from zinc oxide, zinc sulfate, calcium oxide, and phosphorous pentoxide Set and harden on contact with blood Repair bone defects
23 Ferric-Calcium-Phosphorous Oxide (FECAP) Ceramics Sets and hardens on contact with water Complete resorption within 60 days Patients with anemia
24 Bioactive or Surface Reactive Ceramics Surface reactive ceramics, upon implant form strong bonds with adjacent tissue Bioglas and Cervital TM Dense and nonporous glasses Hydroxyapatite Coating of metal prostheses
25 Uses of Surface-Reactive Ceramics Coating metal prostheses Reconstruction of dental defects Filling space voided by screws etc. Bone plates and screws Middle ear ossicles Lengthening of rami vertical part of jaw Correcting periodontal defects Tooth replacement
26 Glass Bioglas SiO 2 (42.1% - mol %) CaO (29.0%) Na 2 O (26.3%) P 2 O 5 (2.6%) Ceravital SiO 2 (40-50% - weight %) CaO (30-35%) Na 2 O (5-10%) P 2 O 5 (10-15%) MgO (2.5-5%) K 2 O (0.5-3%)
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